There's another interesting tax-hack that many people might not know: if you're planning buy a car soon, do it before December 31.

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Purchasing a car this December might be a smart idea for taxpayers in states with no state income taxes who itemize and claim the sales tax deduction, according to TaxAudit.

And it's not just for cars. Sales tax is deductible on a number of vehicle purchases, including motor homes, trucks, and even boats and planes.

Vehicle registration fees are also deductible

If you buy a car now, you could deduct vehicle registration fees paid before the end of the year, which are also likely to be axed under the new bill.

Annual car registration fees might be partially deductible on your federal income taxes, although that's only under certain circumstances. According to TurboTax, a portion of the registration fee must be charged based on the vehicle's value — as opposed to its size, age, or other characteristics.

But remember, to deduct vehicle registration fees or the sales tax you pay, you have to itemize your deductions.